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Effect of Sulfur and Antimony on the Intergranular Fracture of Iron at Cathodic Potentials

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Abstract

Antimony, segregated to grain boundaries of iron, was found to be five times more effective than sulfur in promoting intergranular fracture of iron when tested in IN H2SO4 at cathodic potentials. A decrease in the ductility of iron accompanied the fracture mode change at increasing cathodic potentials. The effectiveness of antimony relative to sulfur was determined from straining electrode tests on iron and iron + 250 appm antimony alloys heat treated at 800 °C and 600 °C to produce different grain boundary chemical compositions. Grain boundary compositions were determined by Auger Electron Spectroscopy (AES). Similar grain boundary sulfur concentrations of 0.2 monolayers were observed by AES for the iron and iron + 250 appm antimony alloy after an anneal of 240 hours at 600 °C, while 0.08 monolayers of antimony was observed for the iron + 250 appm antimony alloy. These results suggest that sulfur and antimony do not compete for grain boundary sites.

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Authors and Affiliations

  1. Metallurgy Research Section, Pacific Northwest Laboratory, P. O. Box 999, 99352, Richland, WA

    R. H. Jones (Staff Scientist), S. M. Bruemmer (Senior Research Scientist), M. T. Thomas (Staff Scientist) & D. R. Baer (Senior Research Scientist)

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  1. R. H. Jones
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  2. S. M. Bruemmer
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  3. M. T. Thomas
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  4. D. R. Baer
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Jones, R.H., Bruemmer, S.M., Thomas, M.T. et al. Effect of Sulfur and Antimony on the Intergranular Fracture of Iron at Cathodic Potentials. Metall Trans A 13, 241–249 (1982). https://doi.org/10.1007/BF02643314

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